Morphology and composition of chalcopyrite, chromite, Cu, Ni-Fe, pentlandite, and troilite in vugs of 76015 and 76215Vugs from 76015 and 76215 are lined with euhedral crystals of plagioclase, pyroxene, ilmenite, Ni-Fe, and troilite. Smaller crystals of chromite, pentlandite, and chalcopyrite occur on the surface of the troilite in 76015. Wire Cu and dendritic-metallic Cu occurs with metallic Ni-Fe and troilite in some vugs of 76215. Troilite in both samples may have crystallized from an immiscible sulfide liquid. With falling temperature, chalcopyrite, and pentlandite may have exsolved from the troilite in 76015. By contrast, metallic Cu may have formed in 76215 by thermal breakdown of a bornite, troilite, and Ni-Fe assemblage which originally crystallized from a low-Ni immiscible sulfide liquid.
Document ID
19780062731
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Carter, J. L. (Texas, University Richardson, Tex., United States)
Clanton, U. S. (Texas Univ. at Dallas Richardson, TX, United States)
Laughon, R. B. (Texas Univ. at Dallas Richardson, TX, United States)
Mckay, D. S. (Texas Univ. at Dallas Richardson, TX, United States)
Usselman, T. M. (NASA Johnson Space Center Houston, Tex., United States)
Fuhrman, R. (Lockheed Electronics Co., Inc. Houston, Tex., United States)